This code both changes the color of the black rectangle in Processing and lights up the LEDs connected to pins 11 and 12 when the push buttons are pressed. The push buttons are connected to pins 4 and 5. When the button connected to pin 5 is pressed, it lights up the LED connected to pin 11 and changes the black rectangle to blue. When the button connected to pin 4 is pressed, it lights up the LED connected to pin 12 and changes the black rectangle to green. When both buttons are pressed, both LEDs light up and he black rectangle changes to red.